Casing for a watch



FIG. 1 is a persepctive elevational view of a "casing for a watch";

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof; the other side being a mirror image is not shown;

FIG. 4 is an end elevational view thereof; the other end being a mirror image is not shown; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a "casing for a watch", as shown and described. 